‘Evil’ note in Amazon package

April Dorsett, 13, said she found the words scribbled on an invoice inside a £30 ($54) make-up advent calendar her dad Philip had ordered for her.

"Help me please, PMP staff are evil," the note said. PMP is a recruitment agency used by Amazon to fill jobs at distribution centres in the UK, the Mirror reports.

"I want to know if it's a prank or if they have people in sweatshops," said April's mum Kim, from Bolton, Greater Manchester.

"My other half ordered the calendar as a present. He ordered a note in it saying 'love from mum and dad'. We asked April, 'Have you read the note?' and she said, 'Do you mean this one?' That's when we saw it. I thought, 'This isn't right'.

"Then I thought it must be a prank and I was overreacting, but then people pointed out all the stories about Amazon lately."

A teen girl claims she found this note hidden inside an Amazon package.

PMP and Amazon are investigating the incident after the family flagged it up to the online delivery giant.

"My daughter was worried," Kim said. "She is a vegan and she likes to know people and animals are OK. This is quite worrying. It's the sort of thing you hear about happening in sweatshops in China."

It comes after a Mirror investigation claimed Amazon employees were so tired of their long working conditions they were falling asleep on their feet.

Mum Kim Dorsett said she hoped the note was just a prank.

Other claims included workers having just nine seconds to process a package and some employees alleging they have timed toilet breaks.

In a statement, PMP said, "PMP Recruitment employs over 100,000 people across a range of clients, many of whom have stayed with us for a number of years or return each year during our peak trading period, so we do not recognise the comment made as being an accurate or fair representation of the employee experience we provide.

"We provide various channels to raise concerns, including a confidential helpline, and have not received any complaints of this nature. We do, however, take such comments extremely seriously and will be investigating in conjunction with our client."